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Patented. July 22, 1919.

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TIIE COLUMBIA PLANOORAPH C0.. WASHINGTON. D. C.-

G-IDEON EFRAIM SANDBLOM, OF GOTTENBORG, SWEDEN, ASSIGNOR TO ELEKTRISKA PANNRENSNINGS AKTIEBOLAGET, 0F GOTTENBORG, SWEDEN.

STEAM-BOILER CLEANER.

Specification of Letters Patent.

Patented July 22, 1919.

Application filed. May 2, 1918. Serial No. 232,093.

To aZZ whom at may concern:

Be it known that I, GIDEON EFRAIM SAND- BLOM, engineer, a subject of the King of Sweden, residing at Gottenborg, in the county of Gottenborg and Bohus and Kingdom of Sweden, have invented new and useful Improvements in Steam-Boiler Cleaners, of which the following is a specification.

This invention refers to apparatus for steam boiler cleaning and especially for removing boiler scales from the outside of smokes tubes in tube nests of the usual type, where the smoke tubes are spaced rather close to one another, leaving merely a rather narrow intermediate space between themselves. More especially this invention refers to the said class of boiler cleaners, where the incrustations on the smoke tubes are actuated upon by means of chisel shaped tools or similar implements moved along the outside of the tubes.

The improved cleaner apparatus consists in a pair of such chisels suspended on a common holder and spring actuated or of a somewhat elastic material, so that the two members in the pair tend to diverge from one another, thereby causing their sharp edges to act each upon one of two adjacent tubes when the tool is reciprocated perpendicularly to the length direction of the tubes. To control this movement of the tool, so that the edges of the chisels treat the tubes in a proper manner, it is found convenient to provide each of the chisel branches with a projecting arm or an elongated guide portion, which slides against the tubes to be treated, thereby properly directing the chisels when operative.

The reciprocating motion of the chisels combined with the sharp edges of the tools cause the implement to act upon the incrustations by means of blows just as a sharp edged scaling chipper, causing the scale to burst into pleces and thus facilitating its falling down.

In the accompanying drawing Figure 1 illustrates the improved tool operative in a vertical direction upon two adjacent tubes in a tube nest, the tubes shown in cross section,

Fig. 2 the same view with the vertical operative tool and its driving device, as well as a horizontal operative tool of a somewhat modified form and provided to be worked directly by hand, and

Fig. 3 an elevation view of a portion of the tube nest in a smoke tube steam boiler with the mechanically actuated tool and its accessories.

A rod 1 is provided with openings 6 for the suspension of two somewhat elastic members 3, fastened to the rod 1 by means of screw bolts 2 through the openings 6. The members 3 are shaped as fiat chisels with the ends bent apart and sharp edged. The embodiment illustrated in Fig. 1 is provided with longitudinally projecting arms 4, the ends of which are bent inward a little, and which arms 4 rest upon the adjacent tubes 5 to be treated thus guiding the tool in its proper moving direction when operative. According to the embodiment shown in Figs. 2 and .3 the openings 6 in the rod 1 serve also for the suspending of the rod 1 with the chisels 3 on a supporting member 7 by means of a screw bolt 8. The member 7 by means of a bolt 9 is suspended on an arm 10 projecting from a square shaft 11, which shaft is held in position by means of clamping bars 12 and 13, attached by means of screws 14 to the stays 15, which, as usual, are to be found inside the steam boiler to stiffen the tube plate 20. The shaft 11 further is provided with a crank arm 16, which by means of a bolt 18 can be swung as indicated with dot-and-dash lines in Fig. 2 by means of a drag rod 17. The shaft 11 is not necessarily of a' square cross section, but may be round or otherwise shaped and the arm 10 fixed thereto by means of stop screws, long key or the like.

When swinging the shaft 11 by means of the drag rod 17 the crank arm 10 causes the tools 3 to reciprocate, guided between the tubes by means of the arms 4, and the scale 21 on the tubes 5 will be struck just in a proper manner to burst and to fall off the tubes. As soon as the scale is removed on the spot first treated, the arm 10 is slid along the shaft 11, and the adjacent spot of the same pair of tubes will be treated and so on, till the entire length of these two tubes has been cleaned from scale. Now will the tool be lowered down to the pair of tubes next below in such a way, that the bolt 8 for the supporting member 7 is removed and inserted into a higher situated bore 6 in the rod 1. To treat the other vertical rows of the tubes it is necessary'to change the position of the shaft 11 for instance by removing the clamping bars 12, 13 from the stays 15 on to the adjacent stays (not shown in the drawing) or by lengthelr ing the upper clamping bar 12 or in any other suitable way, which may be clearly understood by any one familiar with similar operations.

Having thus described my invention and how it is to be performed, what I claim as new and want to protect by Letters Patent is 1. A boiler tube cleaner for the outside of a tube comprising a shank, outwardly flared arms secured at their inner ends to the shank and provided at their outer ends with cutting edges, and extensions on said arms and projecting longitudinally beyond the same and adapted to moving the arms toward each other when the extensions are inserted between two boiler tubes.

2. A boiler tube cleaner forthe outside of a tube, comprising a shank, outwardly flared resilient arms secured at their inner ends on opposite sides of the shank and at one end of the shank and provided at their outer ends with cutting edges, and extensions integral with the arms and projecting longitudinally therebeyond and adapted to move the arms toward each otherwhen the extensions are inserted between two boiler tubes.

In testimony whereof I have aflixed my signature.

GIDEON EFRAIM SANDBLOM.

' Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents, Washington, D; G. 

